He is credited with the "Bush Doctrine." The Bush Doctrine initially described the policy that the United States
had the right to aggressively secure itself from countries that harbor or give aid to terrorist groups, which was
used to justify the 2001 invasion of Afghanistan. Later it came to include additional elements, including
the controversial policy of preventive war, which held that the United States should depose foreign regimes
that represented a potential or perceived threat to the security of the United States, even if that threat was
not immediate; a policy of spreading democracy around the world, especially in the Middle East, as a strategy
for combating terrorism; and a willingness to pursue U.S. military interests in a unilateral way. (Source: "Bush Doctrine," from Wikipedia, the free encyclopedia.)